Respiration is a series of reactions in which energy is released from glucose glucose: A simple sugar made by the body from food, which is used by cells to make energy in respiration. Aerobic respiration is the form of respiration which uses oxygen. It can be summarised by this equation:
perturbation in Science. A small change in a physical system, most often in a physical system at equilibrium that is disturbed from the outside. Variation in a designated orbit, as of a planet, that results from the influence of one or more external bodies.
Intrusive thought. An intrusive thought is an unwelcome involuntary thought, image, or unpleasant idea that may become an obsession, is upsetting or distressing, and can feel difficult to manage or eliminate. When such thoughts are associated with obsessive-compulsive disorder, depression, body dysmorphic disorder, and sometimes attention-deficit hyperactivity disorder, the thoughts may become paralyzing, anxiety-provoking, or persistent. Intrusive thoughts may also be associated with episodic memory, unwanted wor